I have project64 running on my PC with Mario Kart, Goldeneye, Zelda Master Quest, and I'm trying to find a good soccer game ROM to play.

The interesting thing about playing, say, Mario Kart 64 on ones PC under emulation... is the ability to play it in higher resolution with perfect 60FPS... it both looks and plays better than on the real machine... (besides the few quirks that still needs to be fixed for the game to emulate perfectly).